Teknetics Alpha Hobby Metal Detector: * Numerical category target ID system * 3 Tone discrimination * 1 Tone selection * 6 levels of adjustable discriminations * Discrimination by categories * Single notch selectable by category * Adjustable sensitivity * Battery life indicator * Intuitive menu system * Numerical depth readout * Rubber-button control interface * 1 search mode * All metals motion mode * 7.8 kHz transmit frequency * Preset ground balance * 8" concentric open face coil * Locking ring coil connector * 1/8" and 1/4" headphone jack * Requires one 9V Alkaline battery (not included) * Made in the USA